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been sorting out my choices for a new system and have learned a bunch from all of your responses to my posts and by reading the posts of others. i am extremely grateful to all of you who take the time to educate us.

here is what i believe i want but not sure what else pieces go with it (so i can bounce it off what the contractor will be proposing)

16i HP
auxil heat strips
clean effect air filter
tx803 t-stat

if it make any difference, my system is in a attic in a horizontal layout, i am in the nothern virginia area, and 3 1/2 ton unit.

is there a guide to perfectly matching a system (i.e. what pieces work best with each other) that is available to homeowners?

Back again. You should be aware that Trane's XL16i heat pump requires a matching R-410a frig var speed air handler(4TEE model). Also, the XL16i HP is available in only full ton sizes-ie no 1/2 ton sizes. Not to worry. A 4 ton will do just fine in AC since it has 2 stgs and will actually be a great benefit in heating mode. Of course, your Trane dealer should provide a Manual J heat/cool load calculation in writing as well as make a complete ductwork inspection as to size,condition, supplies/returns, insulation properties, and any airflow problems to be addressed.